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The fourth series of results are connected with a deathrate
of 2 per cent. Here the mean duration of life ranges
from 5.67 years with a birth-rate of 102 and an increase-rate
of 100, to 50 years with a birth-rate of 2 and a stationary
population. With a birth-rate of .5 per cent, and an annual
diminution of l.5 the mean duration of life becomes 91.72;
with a birth-rate of .05 and a diminution of 1.95, 187.32
years.
In the fifth series the death-rate is 2.5 per cent., and
the mean duration of life rises from 5.35 years when the
birth-rate is 102.5 and the increase-rate 100, to 40 when the
birth-rate and death-rate are equal. With a birth-rate of .5
per cent, and an annual diminution of the population by 2 per
cent, the duration of life becomes 79 2/3; and with a birth-rate
of .05 and an annual diminution of 2.45, 157.71.
In the sixth series, with a death-rate of 3 per cent., the
mean duration of life is 5.10 years with a birth-rate of 103
and an increase-rate of 100, and 33 1/3 when the birth-rate and
death-rate are equal. When the birth-rate is .5 per cent.,
and the annual decrease of the population is 2.5 per cent.,
the duration of life is 70.77 years; and when the birth-rate
is .05 and the decrease is 2.95 the duration of life is 136.73.
The seventh series is dependent on a death-rate of 3.5
per cent. In this case the mean length of life ranges from
4.89 years when the birth-rate is 103.5 per cent. and the
increase-rate 100, to 28.57 years when the birth-rate and
death-rate are equal to one another. The duration of life
increases to 63.89 years when the birth-rate is only .5 percent,
and the population diminishes by 3 per cent, per annum,
and to 121.01 when the birth-rate becomes .05 and the
annual diminution per cent. 3.45.